Issue link: https://iconnect007.uberflip.com/i/410144
18 The PCB Magazine • November 2014 The substrates were bended ± 90° and sur- vived 2,500 cycles at a trace width of 50 µm and more than 40,000 cycles at a trace width of 100 µm (Table 1). On the final structure a special cleaning pro- cedures to remove laser residues originated by a laser cut for the final outline was used (Figure 5). These residues may cause shorts along the NOBLE METAL PCB MANuFACTuRING FOR DIRECT IMPLANTS continues Bend R = 1 mm Trace width au metal thickness: 0.5 µm 20 µm 50 µm 60 µm 100 µm Cycles [k = 1000] n/a 2.5k 6k – 12k > 40k table 1: examples of bending test results. figure 5: laser residues on print after final routing (left); print after laser routing including cleaning procedure (right). figure 6: a comparison of a hybrid PCb layout for short term implants and a fully biocompatible layout acting as a permanent implant.